A woman and two children have been found dead at a house, police said.
The 34-year-old woman and two girls, aged nine and four, were discovered at a property in Midcroft, Ruislip, at 6.40pm last night.
Scotland Yard said that detectives from the Homicide and Serious Crime Command were investigating.
At this stage, the deaths are being treated as unexplained and next of kin have been informed.
More top news
Transport for London expects 34,000 vehicles a month will be liable for the Toxicity Charge on top of the £11.50 Congestion Charge.
Drivers of the most polluting vehicles will pay the new £10 T-Charge, meaning a daily payment of £21.50 to enter central London.
Police are hunting for the owners of this jewellery which they believe is stolen